This page explains how Pu Zheng (USATT# 96858)'s rating went from 2561 to 2559 at the Spartans Butterfly Open held on 11 Jun 2021 - 13 Jun 2021. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.